(IAM): Use '@"a', not '@"a{}'.

doc/Protocol-A.texi

@@ -29,7 +29,7 @@
 @iftex
 
 @c ispell-ignore
-@set IAM Inl@"a{}gg @}t mig
+@set IAM Inl@"agg @}t mig
 @set Pell P@"ar Emanuelsson
 @set Kent Kent Eng@-str@"om@penalty-10000
 @set presconf @holl{27,Presentation (av nya) m@"oten}